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Date: Mon, 24 Sep 2007 11:22:50 -0700 From: Ben Greear <greearb@...delatech.com> To: Rick Jones <rick.jones2@...com> CC: Steve Wise <swise@...ngridcomputing.com>, hadi@...erus.ca, Evgeniy Polyakov <johnpol@....mipt.ru>, netdev@...r.kernel.org, Robert Olsson <Robert.Olsson@...a.slu.se> Subject: Re: pktgen question Rick Jones wrote: >>> Perf-wise, you could clone the skbs up front, then deliver them to >>> the nic in a tight loop. This would mitigate the added overhead >>> introduced by calling skb_clone() in the loop doing transmits... >> >> That only works if you are sending a small number of skbs. You can't >> pre-clone several minutes worth of 10Gbe traffic >> with any normal amount of RAM. > > Does pktgen really need to allocate anything more than some smallish > fraction more than the depth of the driver's transmit queue? If you want to send sustained high rates of traffic, for more than just a trivial amount of time, then you either have to play the current trick with the skb_get(), or you have to allocate a real packet each time (maybe with skb_clone() or similar, but it's still more overhead than the skb_get which only bumps a reference count.) I see no other way, but if you can think of one, please let me know. Thanks, Ben -- Ben Greear <greearb@...delatech.com> Candela Technologies Inc http://www.candelatech.com - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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